This is the basic code for Wifi in AP mode.
As you know what AP mode means, this code makes ODROID-GO generating its on Wifi signal and you can access to that AP on your Wifi connectable device.
To do that we've defined the AP information for SSID and password. And give gateway IP address and subnetmask address. These IP addresses should be created as an instance of IPAddress class.
So with this code, it will be on 192.168.4.x IP addresses, and you can connect to that by accessing to 192.168.4.1.
This AP activates with a WiFi.softAP() function.

And to provide a web page, define an WiFiServer instance as a global variable. This begins when the Wifi activates successfully in AP mode.

Next, add a code for setting the blue status LED up and some debugging messages shown on the serial monitor. This should be very helpful to show how the code flows.

Lastly, write down a client listener in the loop() function. This listener code loops and will response only when the client accesses.
We're not providing a description for this web code, the important thing is that you can response as a packet involving a contents you intent.